Convert an emoji img tag to an emoji notation although its alt is emoji code#11

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tomoasleep wants to merge 3 commits intomasterfrom

fix-emoji-rendering

Commits on Oct 24, 2016

Enable DocumentComponent and NodeType to check structural equality
tomoasleep
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Enable emoji element to be shown in emoji notation when it has only emoji code
tomoasleep
committed

Commits on Oct 27, 2016

Allow emoji in listings, tables, links, and headlines
tomoasleep
committed